ptuomov wrote: ↑Tue Aug 03, 2021 2:39 am
Leftcoaster wrote: ↑Tue Aug 03, 2021 1:41 am
Ptuomov, given Exhausted's strong preference for large radius bends such as 4" for 1 3/8" od 0.060" wall, have you succeeded in sourcing similar sizes or are you persevering with ~3" radius?
Has anyone succeeded in sourcing smaller od pre bend in large radius 304L, 316, or 439, none of which suffer from the embrittlement plaguing 304 - - 321 being too expensive for this hobbyist
I've tried Performance Tube, Columbia River, Patriot Exhaust, Cone Engineering, SPD, Burns Stainless etc and none stock 1 3/8" or 1 1/2" od 0.060" wall pipe at 3" radius - - some list it, but a phone call reveals "no stock"
I'm even willing to use std 1018 mild steel pre bend then ceramic coat it, but that's also unavailable
For the summer, I’m working with metric sizes and mild steel. My buddy has a pipe bender setup at work so we get whatever we want from straight pipe.
Congratulations, using metric sizing yet - - not only are 4" radius bends impossible to find in 1 3/8" and 1 1/2" o.d.'s but when "stepped" there's an undesirable 19% increase in area - - if increasing to 2.0" od by 1/8" increments the area difference decreases by 17, 16, 15, and 14%; where possible a 15% area reduction being preferred at each step
Starting at 1 5/16"od and increasing to 1 3/4" with 1/16" increments, it seems metric equivalents are 32, 35, 38, 40, 42, and 45mm ods, which if they can be "slipped" into one another and depending on wall thickness, can create area differences closer to 15%
Are you able to share the diameters, wall thickness, and radius' you're working with - - and whether your colleague may be willing to supply other customers?
I reached out to Brazilian and Argentine manufacturers, but it appears their aftermarket relies on inch sizes created by imported US dies